I am aware, but I wanted to step through this building up from the very beginning, for this is a perplexing case."

JJJJ couldn't help but leak excitement through levels 2 and 5.

A quick exchange in multiple levels between the two resulted, where KKKK conveyed that this intense interest in interesting problems, especially in layer theory, was the second-most important reason that JJJJ had been called for; the most important being JJJJ's keen intellect.

It depends on the game, the mood, etc. Just knowing something acheivement-worthy is coming up can detract, or as someone else said, the achievement popping up itself can ruin the mood or flow of the game.

There can be some achievements that ruin parts of games for people-- perhaps spoiling a story element, or revealing that there's a secret somewhere that the player would have rather found on their own.